MAX17553
4V to 60V, 50mA, Ultra-Small, High Efficiency, Synchronous Step-Down DC-DC Converter
60V, Low IQ Synchronous Buck Regulator Enables High Efficiency
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Overview
Features and Benefits
- Reduces External Components and Total Cost
- No Schottky–Synchronous Operation
- Internal Control Loop Compensation
- Internal Fixed Soft-Start
- All-Ceramic Capacitors, Ultra-Compact Layout
- Reduces Number of DC-DC Regulators to Stock
- Wide 4V to 60V Input Voltage Range
- Adjustable Output Range from 0.8V up to 90% of VIN (MAX17553C)
- Delivers Up to 50mA Load Current
- 150kHz to 1.5MHz Adjustable Switching Frequency
- Reduces Power Dissipation
- 91.5% Full Load Efficiency (VIN = 24V, VOUT = 5V)
- Higher Light-Load Efficiency with Discontinuous-Conduction Mode (DCM) Operation
- Power Loss Reduction with External Boot-Strap Input (FB/VO) for Internal Circuitry (MAX17553A and MAX17553B only)
- 3.8μA Shutdown Current
- Flexible Design
- Programmable EN/UV and HYST Threshold
- Open-Drain Output Active-Low RESET for Output Status Monitoring
- Robust Operation
- Built-in Hiccup Mode Overload Protection
- Overtemperature Protection
- CISPR32 Class B Compliant
- Wide -40°C to +125°C Ambient Operating Temperature, -40°C to +150°C Junction Temperature
Product Details
The MAX17553 is an ultra-small, high-efficiency, high voltage, synchronous step-down DC-DC converter with integrated MOSFETs that operates over a wide input voltage range from 4V to 60V and delivers up to 50mA of load current. The MAX17553 is available in three variants: MAX17553A, MAX17553B, and MAX17553C. MAX17553A and MAX17553B are fixed 3.3V and 5V output voltage devices, respectively. MAX17553C is an adjustable output (0.8V to 0.9 x VIN) device. The feedback-voltage regulation accuracy of the converters over the -40°C to +125°C temperature range is ±1.5% for MAX17553A and MAX17553B, and ±1.25% for MAX17553C.
The device features a peak-current-mode control architecture. During normal operation, at each rising edge of the clock, the high-side p-MOSFET turns on and remains on until either the appropriate or maximum duty cycle is reached, or the peak current limit is detected. During the high-side p-MOSFET on-time, the inductor current ramps up. During the rest of the switching cycle or until the inductor current reaches zero, the high-side p-MOSFET remains off and the low-side n-MOSFET remains on, and the inductor current ramps down. The device features the Discontinuous Conduction Mode (DCM), in which the negative inductor current is inhibited to enable higher light load efficiency. In DCM, the device operates at a fixed switching frequency until the minimum on-time is reached. If the load demand is less than the energy corresponding to the minimum on-time pulse, the converter skips pulses to maintain output voltage regulation.
A fixed soft-start time of 3.2ms (typ) allows users to reduce input inrush current. An open-drain active-low RESET feature provides a power-good signal to the system upon achieving successful regulation of the output voltage.
Applications
- Factory Automation
- Aftermarket Market Automotive
- General Point of Load
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (3)
Documentation & Resources
Tools & Simulations
EE-Sim Power® Tools
The EE-Sim DC-DC Converter Tool uses your requirements to quickly create a complete power design including a schematic, BOM with commercially available parts, and time and frequency domain simulations. Your customized schematic can be downloaded for further analysis in the standalone EE-Sim OASIS Simulator, featuring SIMPLIS and SIMetrix SPICE engines.
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Evaluation Boards
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.